Four small titted tamper proof Torx screws hold the vented side cover to the unit. Two of the screws are under the narrow plastic trim that easily unsnaps at the top of that cover. Gently removing the cover with all of the wires still attached exposes the weighted mechanical saftey (anti-tilt) switch that allows for the possibly bent electrical contacts to be readjusted. Check and tighten any loose or overheated spade connectors and the rest of the operations may not need any further attention.

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Can you describe what you mean by "does not respond correctly to switches"? Does your heater make any heat? Does your unit have a thermostat and do you hear the it click on/off when you adjust it?? Do you have one or two (high or low) heating ranges? If it has two, does it make heat when on just one or the other range?

The HZ-709 has safety features that might prevent its subsequent operation.
1 - It has a tip over switch but the heater should operate normally when it's upright again.
2 - A thermal cut-off fuse will permanently shut down the heater should it operate at a higher than normal temperature. Was it operating when it fell over, or could it have overheated?

If it's none of those, try contacting the manufacturer Kaz directly by email, Facebook, Twitter, etc. as the HZ-709 has a 3-year warranty.

The left button under the temperature display lets you toggle between the heat output (high, medium and low) settings. Press the left or right side of the buttons. The center button sets the timer; press the left side of the button repeatedly to increase the run time. Press the right side to lower the length of time before the heater shuts off. The right hand button sets the desired final temp. Again it's an up/down toggle on the left and right sides of the button. Once you get to the desired temperature (in 1 degree increments), the display will return to showing the current temperature three seconds after you release the button.

here is a REAL solution... as i just fixed this myself... what you need to do is take apart the heater... this is easy to do, all you need is a screwdriver for this part... on top there is a panel, this can be taken off with a butter knife if you dont have a screwdriver... anyways, underneath this panel are 2 screws, take those out, flip the heater upside down, and take out the other two screws... now the whole side panel will come off... after that, you pull all three plugs off the thermostat with the heater on the flat side opposite, next use a pinch pliers to remove the bolt that the the plugs were just attached to, the next part they tell you not to do, well i guess they tell you not to do any of this... lol... but yeah, put engine oil inside... it heats the same as the heater oil... put the plug back in, and use Liquid Nails clear sealant under the electrical stuff (do not put it on the metal part surrounding it as this will be come a fire hazard then) reconnect the plugs in the order you took them off from (white one is on the bottom) put the heater back together and you are golden! XD hope this helps!